Heat dissipation device

ABSTRACT

A heat dissipation device includes a first heat sink and a second heat sink. The first heat sink includes a first heat spreader and a plurality of fins. The first heat spreader includes a receiving structure having a first tooth and two second teeth. The first tooth is located between the second teeth to define two first grooves between the first tooth and the second teeth. The second heat sink includes a second heat spreader and a plurality of fins. The second heat spreader includes a protruding structure having two first inserting portions. When the second heat sink is assembled to the first heat sink, the each of the first inserting portions is inserted in the first groove of the first heat spreader and deformed to be firmly engaged in the first groove and clasped by the first tooth.

BACKGROUND

1. Technical Field

The disclosure relates to heat dissipation devices, and particularly toa heat dissipation device comprising at least two heat sinks connectedtogether.

2. Description of the Related Art

With continuing developments in technology, heat-generating electroniccomponents such as CPUs (central processing units) provide improvedperformance such as faster processing speeds. However, such electroniccomponents also tend to generate increased amounts of heat, whichrequires immediate dissipation. Often, a heat sink is employed toprovide such heat dissipation. The heat sink absorbs heat from theelectronic component and dissipates the heat to ambient air.

Generally, for achieving different heat dissipation according todifferent needs, the dimension of the heat sink has to be changed.However, a change of the die for forming the heat sink raises aconsiderable cost burden. Furthermore, a larger heat sink for a highpower electronic component needs to be manufactured by driving analuminum stock through a large mold, which is difficultly manufacturedand requires a high manufacture cost.

It is thus desirable to provide a heat dissipation device which canovercome the described limitations.

BRIEF DESCRIPTION OF THE DRAWINGS

The components of the drawings are not necessarily drawn to scale, theemphasis instead being placed upon clearly illustrating the principlesof the embodiments of the display device. Moreover, in the drawings,like reference numerals designate corresponding parts throughout severalviews.

FIG. 1 is an isometric, assembled view of a heat dissipation device,according to an exemplary embodiment.

FIG. 2 is an exploded view of the heat dissipation device of FIG. 1.

FIG. 3 is a partial, front view of the heat dissipation device of FIG.1, wherein the heat dissipation device is partially assembled.

FIG. 4 is partial, front view of the heat dissipation device of FIG. 1,wherein the heat dissipation device is substantially assembled together.

DETAILED DESCRIPTION

Referring to FIG. 1, a heat dissipation device 10 in accordance with anembodiment of the disclosure is shown. The heat dissipation device 10includes a first heat sink 100 and a second heat sink 200 jointed to thefirst heat sink 100.

Each of the first heat sink 100 and the second heat sink 200 isintegrally formed of a metal with a good heat conductivity such asaluminum. In this embodiment, each of the first heat sink 100 and thesecond heat sink 200 is made of aluminum extrusion and is extruded alonga lengthways direction from a front end to a rear end thereof.

Referring to FIG. 2, the first heat sink 100 includes a first heatspreader 110 and a plurality of spaced fins 120 extending upwardly froma top surface of the first heat spreader 110.

Referring also to FIG. 3, the first heat spreader 110 comprises areceiving structure 130 at a lateral portion thereof. The receivingstructure 130 includes a first tooth 131, two second teeth 132 and twothird teeth 133. The second teeth 132 are spaced to the first tooth 131and respectively located at a top side and a bottom side of the firsttooth 131. The third teeth 133 are spaced to the second teeth 132. Oneof the third teeth 133 is located at a top side of a higher second tooth132, and the other third tooth 133 is located at a bottom side of alower second tooth 132. Thus, each of the second teeth 132 is locatedbetween the first tooth 131 and a corresponding third tooth 133. Thefirst tooth 131, the second teeth 132 and the third teeth 133 extendalong the lengthways direction and each have a length as same as that ofthe first heat spreader 110. The first heat spreader 110 defines a firstgroove 134 between the first tooth 131 and each of the second teeth 132,and defines a second groove 135 between each of the second teeth 132 andan adjoining third tooth 133.

The first tooth 131 is symmetric about a central horizontal line. Thefirst tooth 131 has a thickness gradually increasing from a root jointedto the first heat spreader 110 to an outer free end thereof. Each of thesecond teeth 132 has a thickness gradually decreasing from a rootjointed to the first heat spreader 110 to an outer free end thereof. Inthis embodiment, the first tooth 131 has a dovetailed section and eachof the second teeth 132 has a triangular section as viewed from a frontend of the first heat spreader 110. Each of the third teeth 133 has arectangular configuration as viewed from the front end of the first heatspreader 110. The first tooth 131 has an inclined clasping surface 131 arespectively at a top side and a bottom side thereof. The second teeth132 each have a guiding surface 132 a opposite to the adjoining claspingsurface 131 a. Each of the clasping surfaces 131 a of the first tooth131 and the corresponding guiding surface 132 a cooperatively define andsurround the first groove 134. A top one of the first grooves 134 slantsupwardly and the bottom one of the first grooves 134 slants downwardsfrom inside to outside. A top one of the second grooves 135 slantsdownwards and a bottom one of the second grooves 135 slants upwardlyfrom inside to outside.

The second heat sink 200 includes a second heat spreader 210 and aplurality of spaced fins 220 extending upwardly from a top surface ofthe second heat spreader 210. The second heat spreader 210 comprises aprotruding structure 230 at a lateral portion thereof. The protrudingstructure 230 comprises two first inserting portions 231 and two secondinserting portions 232 at a lateral surface of the second heat spreader210. The first inserting portions 231 and the second inserting portions232 are spaced to each other. The second inserting portions 232 arelocated at outer sides of the first inserting portions 231. The firstinserting portions 231 are approximately parallel to each other. A topone of the second inserting portions 231 slants upwardly, and the bottomone of the second inserting portions 231 slants downwards. Each of thefirst inserting portions 231 and the second inserting portions 232 has asmooth free end.

Referring to FIGS. 3 and 4, in assembly, the protruding structure 230 ofthe second heat sink 200 is pushed to insert into the receivingstructure 130 of the first heat sink 100. The second inserting portions232 are gradually engaged into the second grooves 135 of the first heatspreader 110. The first inserting portions 231 firstly contact theguiding surfaces 132 a of the second teeth 132 and slide into the secondgrooves 135 by the guiding surfaces 132 a. When parts of the firstinserting portions 231 are received into the first grooves 134, the freeend of the first tooth 131 abuts the first inserting portions 231. Thefirst inserting portions 231 are deformed by a press of the first tooth131 of the first heat spreader 110. Therefore, the first insertingportions 231 are substantially inserted into the first grooves 134 ofthe first heat spreader 110 and tightly contact the clasping surfaces131 a and the guiding surfaces 132 a. Since the first inserting portions231 are deformed to have shapes corresponding to shapes of the firstgrooves 134, a top one of the first inserting portions 231 extendsupwardly from the first heat sink 100 to the second heat sink 200, and abottom one of the first inserting portions 231 extends downwards fromthe first heat sink 100 to the second heat sink 200. The first insertingportions 231 are clasped by the first tooth 131 and the second teeth132, whereby the first heat sink 100 and the second heat sink 200 aresecured to each other.

Alternatively, the heat dissipation device 10 can include more than twoheat sinks each of which simultaneously comprises a receiving structureand a protruding structure opposite to receiving structure, and the heatsinks can be selectively combined together. Since an amount of the heatsinks can be changed, a size of the heat dissipation device 10 can bechanged for various requirements. The size of the heat dissipationdevice 10 in accordance with the present disclosure can be changedwithout requiring a new mould/die. Thus, the cost for manufacturing theheat dissipation device 10 can be considerably reduced.

It is to be further understood that even though numerous characteristicsand advantages have been set forth in the foregoing description of theembodiment(s), together with details of the structures and functions ofthe embodiment(s), the disclosure is illustrative only; and that changesmay be made in detail, especially in the matters of shape, size, andarrangement of parts within the principles of the disclosure to the fullextent indicated by the broad general meaning of the terms in which theappended claims are expressed.

What is claimed is:
 1. A heat dissipation device comprising: a firstheat sink comprising a first heat spreader and a plurality of finsextending from the first heat spreader, the first heat spreadercomprising a receiving structure, the receiving structure comprising afirst tooth and two second teeth, the first tooth being located betweenthe second teeth to define two first grooves between the first tooth andthe second teeth; and a second heat sink comprising a second heatspreader and a plurality of fins extending from the second heatspreader, the second heat spreader comprising a protruding structure,the protruding structure comprising two first inserting portions;wherein when the second heat sink is assembled to the first heat sink,the each of the first inserting portions is inserted in the first grooveof the first heat spreader and deformed to be firmly engaged in thefirst groove and clasped by the first tooth.
 2. The heat dissipationdevice of claim 1, wherein a top one of the first grooves slantsupwardly and the bottom one of the first grooves slants downwards frominside to outside.
 3. The heat dissipation device of claim 2, whereinthe first tooth has a thickness gradually increasing from a root jointedto the first heat spreader to an outer free end of the first tooth, eachof the second teeth having a thickness gradually decreasing from a rootjointed to the first heat spreader to an outer free end thereof.
 4. Theheat dissipation device of claim 3, wherein the first tooth has adovetailed section and each of the second teeth has a triangularsection.
 5. The heat dissipation device of claim 2, wherein each of thefirst inserting portions has a smooth free end.
 6. The heat dissipationdevice of claim 2, wherein the first inserting portions are parallel toeach other before engaging into the first grooves.
 7. The heatdissipation device of claim 6, wherein the first tooth has two claspingsurfaces, each of the second teeth having a guiding surface facing theadjoining clasping surface, the first inserting portions being guided bythe guiding surfaces into the first grooves and clasped by the claspingsurfaces after assembly.
 8. The heat dissipation device of claim 1,wherein the receiving structure comprises two third teeth, each of thesecond teeth and adjoining third tooth together defining a secondgroove, the protruding structure comprising two second insertingportions to insert into the second grooves.
 9. The heat dissipationdevice of claim 1, wherein each of the first heat sink and the secondheat sink is made of aluminum extrusion and is extruded along alengthways direction from a front end to a rear end thereof.
 10. A heatdissipation device comprising a plurality of heat sinks, each of theheat sink comprising a heat spreader and a plurality of fins extendingfrom the heat spreader, the heat spreader comprising a receivingstructure and a protruding structure, the receiving structure comprisinga first tooth and two second teeth, the first tooth being locatedbetween the second teeth to define two first grooves between the firsttooth and the second teeth, the protruding structure comprising twofirst inserting portions, the first inserting portions of the protrudingstructure of one heat sink being inserted in the first grooves of thereceiving structure of another heat sink and deformed to be firmlyengaged in the first groove and clasped by the first tooth.
 11. The heatdissipation device of claim 10, wherein a top one of the first groovesslants upwardly and the bottom one of the first grooves slants downwardsfrom inside to outside.
 12. The heat dissipation device of claim 11,wherein the first tooth has a thickness gradually increasing from a rootjointed to the heat spreader to an outer free end of the first tooth,each of the second teeth having a thickness gradually decreasing from aroot jointed to the heat spreader to an outer free end thereof.
 13. Theheat dissipation device of claim 12, wherein the first tooth has adovetailed section and each of the second teeth has a triangularsection.
 14. The heat dissipation device of claim 11, wherein each ofthe first inserting portions has a smooth free end.
 15. The heatdissipation device of claim 11, wherein the first inserting portions areparallel to each other before engaging into the first grooves.
 16. Theheat dissipation device of claim 10, wherein each of the heat sinks ismade of aluminum extrusion and is extruded along a lengthways directionfrom a front end to a rear end thereof.